Usage of phosphoric acid:
Main raw material, yellow phosphorus(p4). Technical grade phosphoric acid can be directly used as polishing agent for aluminum products, rust presenter for steel and iron phosphate agent, metal cleanser organic syganic synthesis catalyst, fine electronic plating. Food grade used as acidulates in acidic drinks and also used in sugar fefining.

Phosphoric  acid
Specifications	Industrial  grade	Food  grade
H3PO4	85.0%  min	85.0%  min
Chloride,   as  Cl	0.0005%  max	0.0005%  max
Sulfate,   as  SO4	0.005%  max	0.005%  max
Iron,   as  Fe	0.002%  max	0.002%  max
Arsenic,   as  As	0.005%  max	0.0001%  max
Heavy  metal,   as  Pb	0.001%  max	0.001%  max
Whiteness	30%  max	30%  max